| Psittacorhynchus verweyi den Hartog, 1968 | October, 1964 | intertidal salt marsh | sand | transition belt between mud-flat and salt-marsh, where the glass-wort, Salicornia europaea, forms an association. | 
| Proxenetes bilioi den Hartog, 1966 | Oct 1964 |  |  | salt-marsh area south of Bergen op Zoom.  collected by Bilio.  transition belt between mud-flat and salt-marsh, where the glass-wort, Salicornia europaea, forms an association. | 
| Macrostomum balticum Luther, 1947 | Mar 1964 |  |  | salt-marsh area.  transition belt between mud-flat and salt-marsh, where the glass-wort, Salicornia europaea, forms an association. | 
| Proxenetes intermedius den Hartog, 1966 | Oct 1964 |  |  | salt-marsh area south of Bergen op Zoom, collected by Bilio.  euhaline part of the Deltaic ares. | 
| Proxenetes minimus den Hartog, 1966 | Oct 1964 |  |  | Salt-marsh south of Bergen op Zoom.  collected by Bilio.   Deltaic area characterizeds the species as very euryhaline. | 
| Proxenetes segmentatus den Hartog, 1966 | Oct 1964 |  |  | Salt-marsh south of Bergen op Zoom.  collected by Bilio.   In the transition between mud-flat and salt-marsh, where the glass-wort, Salicornia europaea, is the only phanerogam, P. segmentatus is probably not uncommon. | 
| Proxenetes britannicus den Hartog, 1966 | Oct 1964 |  |  | Salt-marsh area south of Bergen op Zoom.  collected by Bilio. | 
| Proxenetes puccinellicola Ax, 1960 | Oct 1964 |  |  | Salt-marsh area south of Bergen op Zoom (Bilio, personal communication) | 
| Proxenetes cisorius den Hartog, 1966 | Oct 1964 |  |  | salt-marsh area south of Bergen op Zoom.  (Bilio, personal communication) | 
| Proxenetes karlingi Luther, 1943 | Oct 1964 |  |  | salt marsh south of the town of Bergen op Zoom, collected by Bilio. | 
| Messoplana elegans Luther, 1948 | Oct 1964 |  |  | Salt-marsh area south of Bergen op Zoom, collected by Bilio. |